34 C.F.R. § 648.62
(b) After payment of a fellow's tuition and fees, the institutional payment may be applied against educational expenses of the fellow that are not covered by tuition and fees and are related to the academic program in which the fellow is enrolled. These expenses include the following:
(c) The institutional payment must supplement and, to the extent practical, increase the funds that would otherwise be made available for the purpose of the program and, in no case, to supplant institutional funds currently available for fellowships.
(Authority: 20 U.S.C. 1135b, 1135d)